/* 去掉 p 标签的 margin */
.no-margin {
    margin: 0;
  }
.chat{
    height: 100%;
    position: relative;
    .chatBox{
        height: calc(100vh - 200px);
        overflow: auto;
        scrollbar-width: none;
    }
    .chatInput{
        position: absolute;
        width: 100%;
        bottom: 0;
    }
}